Cryptography – Communication system using cryptography – Pseudo-random sequence scrambling
Reexamination Certificate
1999-03-11
2009-08-25
Hoffman, Brandon S (Department: 2436)
Cryptography
Communication system using cryptography
Pseudo-random sequence scrambling
C380S210000
Reexamination Certificate
active
07580525
ABSTRACT:
A sub-scrambling/descrambling method and device enhances the degree of scrambling of linear PCM data. Data is delimited at predetermined times, and the minimum value of a run is found and used as annex information. The run part is replaced with an arbitrary irreversible random data string, which is processed by a main scrambling device to generate transmission data. After main descrambling of the transmission data, a descrambling device takes out the annex Information and replaces the random data string with a predetermined “0” or “1” run according to the annex information. Thus, the degree of scrambling of linear PCM data is enhanced as much or more than compressed video data.
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Hoffman Brandon S
Panasonic Corporation
Rossi Kimms & McDowell LLP
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